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Question:
(a) Besides privacy, what other security functions does Pretty Good Privacy (PGP) provides?
(b) What is the Post Office Protocol (POP) used for? Why is it important that POP uses authentication, whereas the Simple Mail Transfer Protocol (SMTP) does not?
(c) When worms attack the e-mail client, the e-mail servers (the Mail Transfer Agent (MTA) and the Mail Delivery Agent (MDA)) get overwhelmed as well. Explain why.
(d) What do you meant by spam? Blocking lists are typically used to prevent spam. Discuss the effectiveness of using blocking list. How do ISPs prevent their clients from sending spam?
(e) What do you understand by the term Virtual Private network (VPN)? Describe how IPSec can be used to implement a VPN.
(f) Compare and contrast IPSec and SSH.
FRAGMENTATION One method is to limit datagram size to smallest MTU of any server. IP needs fragmentation i.e. datagrams can be divided into pieces to fit in network with small
QUESTION (a) Consider the following digital bit stream 01001100 is to be encoded in: i. NRZ-I ii. Pseudoternary iii. Manchester iv. Differential Manchester Show th
Question: (a) Explain the following terms: Information Communication Technology, Operating System and Application Software. (b) Define what a computer is, give four anatomi
RING topology all computers are connected in loop. A ring topology is a network topology in which every node connects to exactly two other devices, forming a single continuous pa
Maximum Transmission Unit (MTU) Each hardware method specification adds the definition of the maximum size of the frame data area, which is known the Maximum Transmission Uni
Security Clearances For a security clearance in organizations each data user should be assigned a single level of authorization indicating classification level. Before approachi
Evaluations, Assessment, and Maintenance of Risk Controls When the control strategy has been implemented, it should be monitored and measured on an ongoing basis to determine ef
Hypothetical reliable data transfer protocol: A jumping window based Go-back-N ARQ protocol for file transfer using UDP as the transport protocol: In this protocol, a window o
Explain the architecture of ISDN.....?
TRANSMISSION ERRORS: Transmission exceptions may happen due to different causes for example power surges or interference may delete data during transmission. In result of wh
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